I would suggest visiting other centers in your area so that you can get a feel for what an infant/toddler room looks like in action along with really studying the different regulations that your state licensure has along with NAEYC and ITERS. This will help you to set up a high quality environment that works. There are so many things to think about when you have an infant/toddler room that it is hard to mention them all in a post. I wanted to share my opinion on just 2 topics.1) You mentioned how you are concerned about the single-sink issue. I know that where I am from (NJ), to get around the single-sink issue, the teachers will have to clean and disinfect the sink (and work spaces) prior to using the sink for food purposes. This is very difficult when you are taking care of several babies and can lead to staff not following procedures. I've seen some centers get a portable sink (it plugs into the wall and works using a filled jug). While this takes some prep in the morning, it can ensure that you have a clean surface that isn't cross-contaminated.2) You mentioned that the space is big enough for two rooms and then you would divide it. Don't forget to take into consideration how big the cribs are and the proper spacing needed in between the cribs and cots while children are sleeping. I've seen infant rooms where they are big without cribs but with the cribs it is very difficult to space them properly. You'll find in your licensing information the required amount of space in between cribs. Also, someone mentioned that you should put the cribs in separate room. Since infants need to be supervised by sight and sound at all times, it is difficult to do so if you have a barrier such as a wall. Ensure that the staff can always see the infants just by glancing (at all points in the room). This will prevent further compliance headaches in the future.Hope this helps. I think that visiting other infant rooms and talking to people about what they feel works could be very beneficial.Best!